There's ONE missable Namcoin in this. It's the place with.duck boat
Otherwise, enjoy.
Getting platinum in first play through is possible, but it requires shittons of grinding.
So you're better off doing it in NG+.
As with all Tales games, plat is far easier on NG+ due to things like x5 or x10 XP, etc.
Grade is grindable in Hearts though, unlike some other Tales where there's a finite amount you can get in the first playthrough.
Do you guys recommend aiming for the cooking trophy during the 1st play-through ?